Rubber bushing for link mounted brakes



9 1959 c. E. BRICK'ER ET AL 5 9 RUBBER BUSHING FOR LINK MOUNTED BRAKES Filed Aug. 30, 1948 2 Sheets-Sheet l FIG. 2

INVENTORS CARL E. BRICKER BY DONALD D. NEFF ATTORNEY 1956 c. E. BRICKER ETAL 5 9 RUBBER BUSHING FOR LINK MOUNTED BRAKES Filed Adg. so, 1948 2 Sheet-Sheet 2 FIG. 3

FIG. 4

INVENTORS CARL E.BRICKER BY DONALD D. NEFF ATTORNEY i i-timed Dec. 195's em-minc RUBBER BUSHING FOR LIXNK MOUNTED j BRAKES Carl Bricker, Akron, and Donald D. Nefi,

Uniontown, Ohio, assignors to Wingfoot Corporation, Akron, Ohio, a corporation of Delaware Application August 30, 1948, Serial No. 46,914

2 Claims.

Bricker, S. N. 754,705, filed June 14, 1947. This patent application covers a single-disc, pressure type of brake and special mountings for the same. Such mounting means primarily comprise a U- shaped adapter link which positions a roughly C-shaped, brake housing member thereon by engaging a base portion of the housing between arms of the link. A base section of the adapter link is, in turn, pivotally supported by and between the arms of a yoke member which is adapted to be secured to a vehicle. The pivotal connections of the brake housing member to the adapter link, and of the link to the yoke both provide movable joints which, in operation, have proven excellent for achieving uniform brake action but which also are somewhat difficult to control insofar as undesired noise and looseness in the brake member are concerned.

It is the general object of the present invention to provide a new and improved type of mounting means for spot type brakes of the class described.

Another object of the invention is to provide resilient mounting means or bushings for brakes of the class described wherein the resilient bushings will snugly position the associated brake parts when not operating and will flow out of their normal position on brake application so that the bushings will be temporarily distorted to permit metal to metal contact in the brake mounting means while braking action is being efiected.

A further object of the invention is to provide amounting construction for brakes of the class described wherein the mounting is adapted to have a long service life with a minimum of maintenance.

Another object of the invention is to provide relatively inexpensive, easily assembled mounting bushings for spot type brakes.

Another object of the invention is to provide a noiseless mounting for brakes of the class described.

'Yet another object of the invention is to provide a mounting for a spot type brake that aids in reestablishing brake clearance upon brake release.

The foregoing objects and other objects and 2 ,7 advantages of the invention will be made more apparent as the specification proceeds.

Attention is now particularly directed to the accompanying drawing, wherein:

Fig. 1 is a side elevation of a brake embodying the principles of the invention;

Fig. 2 is an enlarged detailed section taken on line 22 of Fig. 1;

Fig. 3 is an enlarged fragmentary vertical section through a modification of the invention; and Fig. 4 is an enlarged fragmentary section of still another modification of the device of the:

invention.

Reference is now made to the details of the through for use in mounting the housing member I.

In order to position the brake housing member I for desirable brake action, all as explained in more detail in the above referred to application of Carl E. Bricker, the brake housing member I is received between and positioned by a substantially U-shaped adapter link 6 which has arm or leg portions I thereon which are in spaced 6, and the adapter link 6 to the yoke 9, respec-" tively, for pivotal movement thereon. These bolts I6 and II have conventional castle nuts I2 se-- cured to the ends thereof and may have lock washers I3 or other similar devices associated;

therewith for retaining the nuts in locked association. with the bolts. Bores formed in the arms I for receiving the bolt Ill therein, whereas a bore I5 is formed in the base of the adapter 6 for engaging with the bolt II that in turn passes through bores I 6 formed in the arm portions of the yoke 9.

*It will be realized that when braking forces"- M are shown are set up in the brake housing I, such forces will tend to set up a rotational movement in such housing member substantially parallel to the brake disc 2. Thus, the means positioning the brake housing member I will be subjected to a longitudinal turning moment setup by the brake housing member and the bolts l and H, or other means used to position the mounting means of the brake, will be subjected to rota tional moments that, in general, fulcrum at one end of the mounting device and tend to cause the opposite end of the mounting device to rotate about the first mentioned end of such a device. In all events, the bolts I0 and If both will have turning moments applied thereto on'the longitudinal axes of such bolts and substantially parallel to the brake disc 2. Lateral or endwise move; ment of the various units used in positioning the brake housing member is prevented bysuitable means and these means may include washers 11, each "ofwhich has an inwardly'directed sleeve or hub section I8. formed thereon. One' of the washers 'l"! is positioned'at a lateral margin of the brake housing member. I and the adapter link 6. and, of. course, the bolts l0 and. H extend therethrough so as to receive the" washer H be.- tween the associated movable surfaces of the brake housing and its mounting means, and between the adapter link and its mounting means to prevent longitudinal movement therebetween. Thesewashers l 1 may be considered to be formed to half-spool shape and they maybe made from "oilite or other suitable self-lubricating material, for example, such as any known powdered metal bearing material which is soaked in oil or graphite composition during its manufacture; In some instances, it may even be desirable to form the washer llifrom other. material although the self-lubricating metallic compositions" are preferred in this embodiment of. the invention. It, will. be noted that Fig. 2.shows that the hub sections l8. are loosely received in counterbores llland, Zflfformed in the ends of the bores 5 and lirespectively.

As a; feature of the invention, a resilient, rubber bearing sleeve or bushing 21 is received in each of. the 'counterbores l9 and2fl. These rubber bushingszl are of such size andshape that, under no load-conditions, the bushings will snugly DOSitionthemembers associated therewith to prevent...rattling orv other undesired. movement thereofand takeup the operating clearance provided tllfirebetween. Eurthermore, and. as a special featureof' the present invention; the bushings 2.1

are not totally confined in the counterbores I9 andzjll. Thus uponbrake application, the rubber bushings areadapted to flow or be otherwise. displaced out of their normal positions and permitniov mentor themembers positioned thereby to set up a metal to metal contactandhave a positive brake supp-art action. Itwillberealized that, the brake positionin mechanis1n.of .the in.-' vention is designed sothat only aminimumlflow. o fthe rubberbushings 2l is.required in order to... efiect the desired metal contactv and supportfor the bralre means in order to position themrigidly permit effective brake operation. However, such clearances simplify manufactureandasseme l of the brake m o nts. as we asrepair ofamei-i "Fig. 2 s-h ows thatthere is an appreciable space provided radially outwardly ofthe sleeye portions IBQ of the washers llintq which the endsof the rubberbushings 2| can flow whena rotational. ggqu farce i t Win ries. Qiis na- .q

the bolt IE and consequently on the adapter link 6 and the bolt 5 i. The inner ends of the bushings 21 may have conventional washers 22 of slightly smaller diameter than the bushings provided thereforto aid in retaining the bushings 2! in position and to aid in preventing undesired cutting or other injury of such members, while also providing limited space for flow of the bushings thereinto. The rubber bushings 21 of the invention also, aid in establishing braking clearance upon release of the brake operational means since such bushings are displaced during braking action and will revert to their normal positions, and thus aid in setting up braking clearance, when the brake control means are released.

Fig. 3 shows a modification of the invention wherein a brake housing member 23 is pivotally associated with a link mounting member 24 by means of a cap screw 25 which extends through a bore 26 in the member 2 and engages with a tap ped hole 212 in the member 23. The cap screw 25 has" a washer 28 associated with the outer end of its shank whereas a washer 29, similar to the. washer ll'is positioned adjacent each side of the member 2G. These washers 2% have sleeve sec.- tions 35 provided thereon which extend, loosely, into the bore 25. formed in the memberv 24-. A rubber bearing sleeve, onrubber bushing. 31 veryv similar to the rubber bushing 25, is provided in this embodiment of the invention and this bushing Si. is received in the bore 2% and is abutted against the inner. end sections or" the sleeve. 39. of the Washer 25. Thus, in this. instance the axially outer portions of the bushing 35 may flow axiallyoutwardly towards the washer 29., when the. brake associated with such a mounting means. is actuated to. occasion displacement of the. rub.- ber forming. the. bushing 33. Oneparticular feature ofv the constructiondisclosedin Fig. 3 is that. rubber. sealing grommets or. rings. 32 may bep'osi tioned around theperiphery of the washers Zflto. aid. in forming a seal'therebetween to. prevent. entity of dirt or other. foreign. material into. the positioning. device of the. invention,

Fig. t shows, a. construction somewhat. similar to that shown in Big. 3 and in this. instance a brake. housing member ii. is pivotally. carried by a link mounting member 42' by.means of a cap. screw ,3. This. cap; screw liihas a rubber-fabric washer G45. associated. therewith and which is forced against the member i2 by means of: a metallidwasher 4.5 which is. engaged with. the. head of the capscrew 33. A washerAfi similar. to the washer 4 3, is alsopositioned. bythe capscrew intermediate the adjacentisurfacesfof the members ll and and. a resilient rubber; bearing sleeve or. bushing. 41? is carried b-ythe main shank. portion of the cap screw dtandiisi positioned in a bore 48 formed in the member- 42 for receivingthe cap screw it. In thisconstructionof the. invention, a.metalliaringikisprovided adjacent the inner. washer. @5111 the. bore $33.. This washer. is radially spaced from the bore is in order to provide space. for flow" of the rubber bushing i? thereinto, when. brake action is effected. Under no load conditions. the. rubber bushing 4i will function. to position. the. cap screw, 43 snugly in thebore r38.

Itwill be appreciated thatin referringtorubber throughout the specification and claims, any. resilient material having the. characteristics. of rubber is. included. Thatis, any material which. is.res ilient and elasticma-y, in general, beused practice of the invention and natural rubber,

synthetic, rubber, and.lrubber iilr material :m'ay

be used in forming the rubber bushings or bearings of the invention. In all instances, the bushing members will snugly position the associated means under no load conditions but will permit limited flow of the rubber to occur when brake action is efiected in order to permit a metal to metal contact to be established temporarily during brake action. Use of the rubber and fabric end washers as shown in Fig. 4 is desirable in that it will permit limited longitudinal movement-of the members with relation to each other on brake application and aid in distributing the stresses set up in the brake at that time.

Naturally, the members shown and described in Figs. 3 and 4 of the drawing relate to brake mounting components of the type disclosed in more detail in Figs. 1 and 2. In all events, the spot type brake of the invention will be adapted to have uniform brake action by virtue of the specialized pivotal mountings provided for the support means therefor and the support means then, in turn, will be provided with effective noload positioning means which may comprise any form of rubber bushing disclosed in this application.

'While in accord with the patent statutes, several embodiments of the invention have been illustrated and described in detail, it is to be particularly understood that the invention is not to be limited thereto or thereby, but that the scope of the invention is defined in the appended claims.

What is claimed is:

1. A spot type brake combination including a rotary disc, a C-shaped housing surrounding a periphery of the disc, hydraulic means carried by the housing and adapted to clamp on opposite sides of the disc, a link, a stationary bracket, means pivotally securing one end of the link to the housing, means pivotally securing the other end of the link to the bracket, said link allowing movement of the housing to and from the side of the disc, said combination being characterized by rubber bushings in said pivotal securing means and functioning torsionally to efiect clearance between the disc and the housing upon release of the hydraulic means, and metal means carried by the pivotal securing means and providing metal to metal contact when the rubber bushings yield radially in absorbing the stopping torque on the disc.

2. A spot type brake combination including a rotary disc, a c-shaped housing surrounding a periphery of the disc, hydraulic means carried by the housing and adapted to clamp on opposite sides of the disc, a link, a stationary bracket, a bolt pivotally securing one end of the link to the housing, a bolt pivotally securing the other end of the link to the bracket, metal bushing means carried by each bolt and effecting a loose, sloppy bearing between the parts pivotally connected, and rubber bushing means carried by each bolt at the end of the metal bushing meansto effect a tight but resilient fit between the parts pivotally connected, said rubber bushing means yielding torsionally without the metal bushings contacting in the movement of the housing toward and from the disc, and yielding radially to bring the metal bushings into contact in absorbing the braking torque on the disc.

CARL E. BRICKER.

DONALD D. NEFF.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,871,861 Rossman Aug. 16, 1932 2,274,859 Eksergian Mar. 3, 1942 2,276,337 Pilager Mar. 17, 1942 2,308,967 Kuss Jan. 19, 1943 2,334,024 Mystrom et al. Nov. 9, 1943 2,351,041 Hawley June 13, 1944 2,400,238 Leighton May 14, 1946 

